<p:menubar xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:p="http://primefaces.org/ui"
      xmlns:ui="http://java.sun.com/jsf/facelets">
<p:submenu label="navigations">
     <p:menuitem  url="welcome.jsf" value="page accueil"  />
     <p:menuitem  url="http://www.google.fr" value="recherche google (fr)"  />
</p:submenu>

<p:submenu label="aide">
     <p:menuitem  url="http://www.google.com" value="recherche google (com)"  />
</p:submenu>

</p:menubar> 
